package com.doyoung.appicker.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Collections;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import android.R;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.widget.ImageView;

public class ImageLoader {

	MemoryCache memoryCache = new MemoryCache();
	FileCache fileCache;
	private Map<ImageView, String> imageViews = Collections.synchronizedMap(new WeakHashMap<ImageView, String>());
	ExecutorService executorService;
	
	public ImageLoader(Context context){
		fileCache = new FileCache(context);
		executorService = Executors.newFixedThreadPool(5);
	}
	
	final int stub_id = R.drawable.ic_menu_help;
	public void DisplayImage(String url, ImageView imageView){
		imageViews.put(imageView, url);
		Bitmap bitmap = memoryCache.get(url);
		if(bitmap != null){
			imageView.setImageBitmap(bitmap);
		}else{
			queuePhoto(url, imageView);
			imageView.setImageResource(stub_id);
		}
	}
	
	public void queuePhoto(String url, ImageView imageView){
		PhotoToLoad p = new PhotoToLoad(url, imageView);
		executorService.submit(new PhotosLoader(p));
	}
	
	private Bitmap getBitmap(String url){
		File f = fileCache.getFile(url);
		
		// from SD cache
		Bitmap b = decodeFile(f);
		if(b != null)
			return b;
		
		// from web
		try{
			Bitmap bitmap = null;
			URL imageUrl = new URL(url);
			HttpURLConnection conn = (HttpURLConnection) imageUrl.openConnection();
			conn.setConnectTimeout(30000);
			conn.setReadTimeout(30000);
			conn.setInstanceFollowRedirects(true);
			InputStream is = conn.getInputStream();
			OutputStream os = new FileOutputStream(f);
			Utils.CopyStream(is, os);
			os.close();
			bitmap = decodeFile(f);
			return bitmap;
		}catch(Exception e){
			e.printStackTrace();
			return null;
		}
	}
	
	// decode image and scales it to reduce memory consumption
	private Bitmap decodeFile(File f){
		try{
			// decode image size
			BitmapFactory.Options o = new BitmapFactory.Options();
			o.inJustDecodeBounds = true;
			BitmapFactory.decodeStream(new FileInputStream(f), null, o);
			
			// Find the correct scale value. It should be the power of 2.
			final int REQUIRED_SIZE = 70;
			int width_tmp = o.outWidth, height_tmp = o.outHeight;
			int scale = 1;
			while(true){
				if(width_tmp/2 < REQUIRED_SIZE || height_tmp/2 < REQUIRED_SIZE)
					break;
				width_tmp/=2;
				height_tmp/=2;
				scale*=2;
			}
			
			// decode with inSampleSize
			BitmapFactory.Options o2 = new BitmapFactory.Options();
			o2.inSampleSize = scale;
			return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
		}catch(Exception e){
			e.printStackTrace();
			return null;
		}
	}
	
	// Task for the queue
	private class PhotoToLoad{
		public String url;
		public ImageView imageView;
		public PhotoToLoad(String u, ImageView i){
			url = u;
			imageView = i;
		}
	}
	
	class PhotosLoader implements Runnable{
		PhotoToLoad photoToLoad;
		PhotosLoader(PhotoToLoad photoToLoad){
			this.photoToLoad = photoToLoad;
		}
		@Override
		public void run() {
			// TODO Auto-generated method stub
			if(imageViewReused(photoToLoad))
				return;
			Bitmap bmp = getBitmap(photoToLoad.url);
			memoryCache.put(photoToLoad.url, bmp);
			if(imageViewReused(photoToLoad))
				return;
			BitmapDisplayer bd = new BitmapDisplayer(bmp, photoToLoad);
			Activity a = (Activity)photoToLoad.imageView.getContext();
			a.runOnUiThread(bd);
		}
	}
	
	boolean imageViewReused(PhotoToLoad photoToLoad){
		String tag = imageViews.get(photoToLoad.imageView);
		if(tag == null || !tag.equals(photoToLoad.url))
			return true;
		return false;
	}
	
	class BitmapDisplayer implements Runnable{
		
		Bitmap bitmap;
		PhotoToLoad photoToLoad;
		public BitmapDisplayer(Bitmap b, PhotoToLoad p){
			bitmap = b;
			photoToLoad = p;
		}
		
		@Override
		public void run() {
			// TODO Auto-generated method stub
			if(imageViewReused(photoToLoad))
				return;
			if(bitmap != null)
				photoToLoad.imageView.setImageBitmap(bitmap);
			else
				photoToLoad.imageView.setImageResource(stub_id);
			
		}
	}
	
	public void clearCache(){
		memoryCache.clear();
		fileCache.clear();
	}
}

























